Dell Force10 S25N-S50N FTOS Configuration Guide FTOS 8.4.2.7 E-Series TeraScal - Page 321

Figure 13-4. Configuring Dell Force10 Systems as a DHCP Relay Device DHCP Server 10.11.2.5 Broadcast Source IP : 10.11.1.5 Destination IP: 255.255.255.255 Source Port: 67 Destination Port: 68 1/3 Broadcast Source IP : 0.0.0.0 Destination IP: 255.255.255.255 Source Port: 68 Destination Port: 67 Relay Agent Address: 0.0.0.0 Unicast Unicast DHCP Server Source IP : 10.11.1.5 10.11.1.5 Destination IP: 10.11.0.3 Source Port: 67 Destination Port: 68 1/4 Unicast Source IP : 0.0.0.0 Destination IP: 10.11.1.5 Source Port: 68 Destination Port: 67 Relay Agent Address: 10.11.0.3 R1(conf-if-gi-1/3)#show config ! interface GigabitEthernet 1/3 ip address 10.11.0.3/24 ip helper-address 10.11.1.5 ip helper-address 10.11.2.5 no shutdown DHCP 001 To view the ip helper-address configuration for an interface, use the command show ip interface from EXEC privilege mode, Figure 250. Figure 13-5. Displaying the Helper Address Configuration R1_E600#show ip int gig 1/3 GigabitEthernet 1/3 is up, line protocol is down Internet address is 10.11.0.1/24 Broadcast address is 10.11.0.255 Address determined by user input IP MTU is 1500 bytes Helper address is 192.168.0.1 192.168.0.2 Directed broadcast forwarding is disabled Proxy ARP is enabled Split Horizon is enabled Poison Reverse is disabled ICMP redirects are not sent ICMP unreachables are not sent Configure Secure DHCP DHCP as defined by RFC 2131 provides no authentication or security mechanisms. Secure DHCP is a suite of features that protects networks that use dynamic address allocation from spoofing and attacks. • Option 82 on page 322 Dynamic Host Configuration Protocol | 321